Nearclick

useful for tablets and slippery mice, corrects for problem where a click has to have mouse down and mouse up in exactly the same place for a click to work by simulating a click even when there is a short drag.

Settings

You can set the radius, in pixels, within which the drag is considered to be a click by adding

nearclick.radius <radius>

to the advanced panel of the JOSM Edit Preferences dialogue. The defaut is 7.

Similarly, adding

nearclick.delay <milliseconds>

will control how long between button down and up is allowed before the drag is no longer considered a click. The default is 250 milliseconds (a quarter of a second).

Download

The JAR file for the plugin is here.
It can also be downloaded and installed directly from the plug-in tab in the JOSM preference dialog.